/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.example.echo;

import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.ssl.SslContext;
import io.netty.handler.ssl.SslContextBuilder;
import io.netty.handler.ssl.util.InsecureTrustManagerFactory;

/**
 * Sends one message when a connection is open and echoes back any received data
 * to the server. Simply put, the echo client initiates the ping-pong traffic
 * between the echo client and server by sending the first message to the
 * server.
 */
public final class EchoClient
{

    static final boolean SSL = System.getProperty("ssl") != null;

    static final String HOST = System.getProperty("host", "127.0.0.1");

    static final int PORT = Integer
            .parseInt(System.getProperty("port", "8007"));

    static final int SIZE = Integer.parseInt(System.getProperty("size", "256"));

    public static void main(String[] args) throws Exception
    {
        // Configure SSL.git
        final SslContext sslCtx;
        if (SSL)
        {
            sslCtx = SslContextBuilder.forClient()
                    .trustManager(InsecureTrustManagerFactory.INSTANCE).build();
        }
        else
        {
            sslCtx = null;
        }

        // Configure the client.
        EventLoopGroup group = new NioEventLoopGroup();
        try
        {
            Bootstrap b = new Bootstrap();
            b.group(group).channel(NioSocketChannel.class)
                    .option(ChannelOption.TCP_NODELAY, true)
                    .handler(new ChannelInitializer<SocketChannel>()
                    {
                        @Override
                        public void initChannel(SocketChannel ch)
                                throws Exception
                        {
                            ChannelPipeline p = ch.pipeline();
                            if (sslCtx != null)
                            {
                                p.addLast(sslCtx.newHandler(ch.alloc(), HOST,
                                        PORT));
                            }
                            // p.addLast(new LoggingHandler(LogLevel.INFO));
                            p.addLast(new EchoClientHandler());
                        }
                    });

            // Start the client.
            ChannelFuture f = b.connect(HOST, PORT).sync();

            // Wait until the connection is closed.
            f.channel().closeFuture().sync();
        }
        finally
        {
            // Shut down the event loop to terminate all threads.
            group.shutdownGracefully();
        }
    }
}
